Active matrix organic light emitting diode display and driving method thereof
AssigneeAu Optronics Corporation
InventorI-Shu Lee
Life of this patent
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Abstract
A display includes a plurality of data lines, a plurality of scan lines, a plurality of pixel circuits, a source driver, a gate driver, a timing controller and a gray scale circuit. The source driver includes a data line driving circuit for generating driving current corresponding to an image to be displayed by a pixel circuit, a current source for pre-charging the pixel circuit and a switch for electrically connecting the current source to the pixel circuit or electrically isolating the current source from the pixel circuit. The timing controller controls the source driver and the gate driver. The gray scale circuit controls the switch of the source driver based on gray scales of images to be displayed by the pixel circuits of a scan line.
Claims15
A method for driving an active matrix organic light emitting diode display comprising the following steps:
- (a) determining whether a gray scale of an image to be displayed by a pixel circuit on a scan line is smaller than a gray scale reference value;
- (b) transmitting a pre-charging current to the pixel circuit if the gray scale of the image to be displayed by the pixel circuit is smaller than the gray scale reference value;
- and
- (c) transmitting signals corresponding to the image to the pixel circuit after transmitting the pre-charging current to the pixel circuit.
An active matrix organic light emitting diode display comprising:
- a plurality of data lines for transmitting data signals;
- a plurality of scan lines for transmitting scan signals;
- a plurality of pixel circuits coupled to corresponding data lines and scan lines;
- a source driver comprising:
- a data line driving circuit for generating a driving current corresponding to an image to be displayed by a pixel circuit;
- a current source for pre-charging a data line before sending the driving current to the data line;
- and
- a switch coupled between the current source and the data line for electrically connecting the current source to the data line, or for electrically isolating the current source from the data line;
- a gate driver coupled to the plurality of scan line for generating control signals;
- a timing controller for controlling the source driver and the gate driver based on video and timing data;
- and
- a gray scale circuit for controlling the switch of the source driver based on a gray scale of an image to be displayed by a pixel circuit of a scan line.
Dependencies are inferred from the claim text.